If you must have .22WMR, the Ruger Single Six is your best option ($200 used, $350 new). If you want a smaller/compact 4" barrel single-action gun, there's the Ruger Bearcat (.22LR only), $325 new in stainless or blue.
If you want DA revo, you pretty much have to give up the .22WMR option. The main quality .22 revos that I'm familiar with are the S&W 34 and 63 (J frame, blued and stainless), running $325-450 used (out of production). The S&W 617 is the modern equivalent of the K22, and is still in production as a K-frame stainless .22LR revo in 6- or 10- shot variations.
Rossi, Charter, and Taurus also make DA .22LR revos, but of somewhat lower quality. Ruger used to make a .22LR DA SP-101, but those are hard to find.
Hope this helps, -MV